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a bulb “a maze ring” solves a problem to replace bulb. Replacement of bulb is hard in blind or high side because it have to watch carefully and need to rotate wrist several times. So we suggest a amazing bulb and socket that is no need to rotate wrist many time and mounted tight.
Yong-in si,gyeong-gi do, South Korea
KYUNG HEE UNIVESITY
Suwon-si, Gyeonggi-do,, South Korea
DONG HA KIM SONG E PART